{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{6}{D{.}{.}{-1}}}
\toprule
Specification:&\multicolumn{1}{c}{Base}&\multicolumn{5}{c}{IV different}                                               \\\cmidrule(lr){2-2}\cmidrule(lr){3-7}
            &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}&\multicolumn{1}{c}{(5)}&\multicolumn{1}{c}{(6)}\\
\midrule
Distance size&       0.002***&               &       0.002***&       0.002***&       0.002***&       0.002***\\
            &      (0.00)   &               &      (0.00)   &      (0.00)   &      (0.00)   &      (0.00)   \\
Distance height&       0.030***&               &       0.036***&       0.030***&       0.030***&       0.026***\\
            &      (0.00)   &               &      (0.00)   &      (0.00)   &      (0.00)   &      (0.00)   \\
Distance Engine power&       0.000***&               &       0.000***&       0.000***&       0.000***&       0.000***\\
            &      (0.00)   &               &      (0.00)   &      (0.00)   &      (0.00)   &      (0.00)   \\
Distance weight&       0.000***&               &       0.000***&       0.000***&       0.000***&       0.000***\\
            &      (0.00)   &               &      (0.00)   &      (0.00)   &      (0.00)   &      (0.00)   \\
Wage manufacturing&       0.140***&       0.123***&               &       0.140***&       0.140***&       0.134***\\
            &      (0.00)   &      (0.00)   &               &      (0.00)   &      (0.00)   &      (0.00)   \\
Distance (Nb.) car size&               &      -0.028***&               &               &               &               \\
            &               &      (0.00)   &               &               &               &               \\
Distance (Nb.) height&               &      -0.003***&               &               &               &               \\
            &               &      (0.00)   &               &               &               &               \\
Distance (Nb.) engine power&               &      -0.015***&               &               &               &               \\
            &               &      (0.00)   &               &               &               &               \\
Distance (Nb.) weight&               &      -0.008***&               &               &               &               \\
            &               &      (0.00)   &               &               &               &               \\
Car height  &      -4.922***&       0.363***&      -7.139***&      -4.910***&      -4.905***&      -5.878***\\
            &      (0.06)   &      (0.06)   &      (0.06)   &      (0.06)   &      (0.06)   &      (0.06)   \\
Car weight  &       0.001***&       0.002***&       0.002***&       0.001***&       0.001***&       0.001***\\
            &      (0.00)   &      (0.00)   &      (0.00)   &      (0.00)   &      (0.00)   &      (0.00)   \\
Engine power (KW)&       0.246***&       0.253***&       0.245***&       0.246***&       0.246***&       0.242***\\
            &      (0.00)   &      (0.00)   &      (0.00)   &      (0.00)   &      (0.00)   &      (0.00)   \\
Electric engine&       2.166***&       1.038***&       2.964***&       2.141***&       2.131***&       3.627***\\
            &      (0.03)   &      (0.03)   &      (0.03)   &      (0.03)   &      (0.03)   &      (0.02)   \\
Hybrid engine&      12.475***&      11.641***&      12.772***&      12.471***&      12.469***&      12.932***\\
            &      (0.01)   &      (0.01)   &      (0.01)   &      (0.01)   &      (0.01)   &      (0.01)   \\
Diesel engine&       4.348***&       4.745***&       4.159***&       4.353***&       4.355***&       3.989***\\
            &      (0.01)   &      (0.01)   &      (0.01)   &      (0.01)   &      (0.01)   &      (0.01)   \\
Car size    &       6.028***&       5.655***&       5.608***&       6.029***&       6.029***&       5.994***\\
            &      (0.01)   &      (0.01)   &      (0.01)   &      (0.01)   &      (0.01)   &      (0.01)   \\
Below category C &      -0.156***&      -0.282***&      -0.347***&      -0.164***&      -0.168***&      -0.468*** \\
            &      (0.01)   &      (0.01)   &      (0.01)   &      (0.01)   &      (0.01)   &      (0.01)   \\
Variable costs&      -0.177***&      -0.353***&      -0.122***&      -0.141***&      -0.137***&      -0.031***\\
            &      (0.00)   &      (0.00)   &      (0.00)   &      (0.00)   &      (0.00)   &      (0.00)   \\
\midrule
$R^2$         &    0.883   &    0.882   &      0.884  &    0.883   &    0.883  &    0.883  \\
F-stat (relevance)&    35,594.99           &     118,385.20          &    30,216.79          &      35,626.07         &      35,639.00         &      34,009.67         \\
\bottomrule
\end{tabular}
}
